From 847d1b71906ed42fa40bdff6bd0e3f9a9d18d0f9 Mon Sep 17 00:00:00 2001
From: Oleksandr Smirnov <olexsmir@gmail.com>
Date: Wed, 29 Oct 2025 15:40:05 +0200
Subject: [PATCH] refactor: make it work on neovim version below 0.12

---
 lua/gopher/_utils/init.lua        | 19 +++++++++++++++++++
 lua/gopher/_utils/struct_tags.lua |  9 ++++-----
 spec/unit/utils_test.lua          | 10 ++++++++++
 3 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/lua/gopher/_utils/init.lua b/lua/gopher/_utils/init.lua
index 345c670..58a17b2 100644
--- a/lua/gopher/_utils/init.lua
+++ b/lua/gopher/_utils/init.lua
@@ -50,4 +50,23 @@ function utils.indent(line, indent)
   return string.rep(char, indent)
 end
 
+---@generic T
+---@param tbl T[]
+---@return T[]
+function utils.list_unique(tbl)
+  if vim.fn.has "nvim-0.12" == 1 then
+    return vim.list.unique(tbl)
+  end
+
+  for i = #tbl, 1, -1 do
+    for j = 1, i - 1 do
+      if tbl[i] == tbl[j] then
+        table.remove(tbl, i)
+        break
+      end
+    end
+  end
+  return tbl
+end
+
 return utils
diff --git a/lua/gopher/_utils/struct_tags.lua b/lua/gopher/_utils/struct_tags.lua
index 5522840..f3f49d2 100644
--- a/lua/gopher/_utils/struct_tags.lua
+++ b/lua/gopher/_utils/struct_tags.lua
@@ -1,3 +1,5 @@
+local u = require "gopher._utils"
+
 ---@param option string
 local function option_to_tag(option)
   return option:match "^(.-)="
@@ -32,12 +34,9 @@ function struct_tags.parse_args(args)
     end
   end
 
-  -- todo: it's incompatible with vim lower 0.12
-  tags = vim.list.unique(tags)
-  options = vim.list.unique(options)
   return {
-    tags = table.concat(tags, ","),
-    options = table.concat(options, ","),
+    tags = table.concat(u.list_unique(tags), ","),
+    options = table.concat(u.list_unique(options), ","),
   }
 end
 
diff --git a/spec/unit/utils_test.lua b/spec/unit/utils_test.lua
index 2d8f0bc..0b71c93 100644
--- a/spec/unit/utils_test.lua
+++ b/spec/unit/utils_test.lua
@@ -46,4 +46,14 @@ utils["should add .indent() 2 tabs"] = function()
   t.eq("\t\t", u.indent(line, indent))
 end
 
+utils["should .list_unique on list with duplicates"] = function()
+  local u = require "gopher._utils"
+  t.eq({ "json", "xml" }, u.list_unique { "json", "xml", "json" })
+end
+
+utils["should .list_unique on list with no duplicates"] = function()
+  local u = require "gopher._utils"
+  t.eq({ "json", "xml" }, u.list_unique { "json", "xml" })
+end
+
 return T